Written by the Indian philosopher Vatsyayana sometime between the 4th century B.C. and the 1st century A.D., the “Kama Sutra” is perhaps the world’s most famous book ever written on love and sexual desire. “Kama” is one of the four Hindu goals of human life and is translated as love, including sexual desire and romantic love. “Sutra” in this context means aphorisms, or rules and lessons, on the subject of love. The “Kama Sutra” has become synonymous with its instructions on sexual positions, but...